Low frequency noise in GaAs structures with embedded In(Ga)As quantum dots

Lee, Ji; Nam, Hyobin; Choi, W. J.; Yu, Bing; Song, Joong-Ho; Hong, Songcheol; Noh, S. K.; Chovet, A.

doi:10.1016/j.cap.2005.07.012

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…48,49 The low-frequency noise are also regarded as a tool for understanding various defect related properties of materials and structures. 50 Asriyan et al have made detailed investigations of the role of low-frequency noise in non-homogeneously doped semiconductors. 48 Recently, we have made some thorough investigations of the role of noise on the excitation kinetics of doped QDs.…”

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confidence: 99%

Influence of Gaussian white noise on the frequency-dependent first nonlinear polarizability of doped quantum dot

Ganguly¹,

Ghosh

2014

Journal of Applied Physics

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Articles you may be interested inThird-order nonlinear optical response of CuInS2 quantum dots-Bright probes for near-infrared biodetection Appl. Phys. Lett. 102, 243702 (2013); 10.1063/1.4811786 Frequency-dependent conductance of Kondo quantum dots coupled to ferromagnetic leads J. Appl. Phys. 109, 07C704 (2011); 10.1063/1.3544491Third-order nonlinear optical properties of a one-and two-electron spherical quantum dot with and without a hydrogenic impurity J. Appl. Phys. 106, 063710 (2009); 10.1063/1.3225100Linear and nonlinear optical absorption coefficients and refractive index changes in spherical quantum dots: Effects of impurities, electric field, size, and optical intensityWe investigate the profiles of diagonal components of frequency-dependent first nonlinear (b xxx and b yyy ) optical response of repulsive impurity doped quantum dots. We have assumed a Gaussian function to represent the dopant impurity potential. This study primarily addresses the role of noise on the polarizability components. We have invoked Gaussian white noise consisting of additive and multiplicative characteristics (in Stratonovich sense). The doped system has been subjected to an oscillating electric field of given intensity, and the frequency-dependent first nonlinear polarizabilities are computed. The noise characteristics are manifested in an interesting way in the nonlinear polarizability components. In case of additive noise, the noise strength remains practically ineffective in influencing the optical responses. The situation completely changes with the replacement of additive noise by its multiplicative analog. The replacement enhances the nonlinear optical response dramatically and also causes their maximization at some typical value of noise strength that depends on oscillation frequency. V C 2014 AIP Publishing LLC. [http://dx.

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confidence: 99%

Influence of Gaussian white noise on the frequency-dependent first nonlinear polarizability of doped quantum dot

Ganguly¹,

Ghosh

2014

Journal of Applied Physics

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“…Since QD suffers from a lot of stress during its growth, lattice defects are generated and they diffuse inside the QD structure. The said low-frequency noise also provides a diagnostic tool for defect related properties of materials and structures [26]. Asriyan et al have extensively studied the role of low-frequency noise in nonhomogeneously doped semiconductors [24].…”

Section: Introductionmentioning

confidence: 99%

Excitation Kinetics of Impurity Doped Quantum Dot Triggered by Gaussian White Noise

Pal¹,

Sinha

Ganguly³

et al. 2013

ISRN Condensed Matter Physics

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We investigate the excitation kinetics of a repulsive impurity doped quantum dot initiated by the application of Gaussian white noise. In view of a comprehensive research we have considered both additive and multiplicative noise (in Stratonovich sense). The noise strength and the dopant location have been found to fabricate the said kinetics in a delicate way. Moreover, the influences of additive and multiplicative nature of the noise on the excitation kinetics have been observed to be prominently different. The investigation reveals emergence of maximization and saturation in the excitation kinetics as a result of complex interplay between various parameters that affect the kinetics. The present investigation is believed to provide some useful perceptions of the functioning of mesoscopic systems where noise plays some profound role.

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“…The notable applications include industrial manufacturing, medicine, remote sensing, space communications, and military uses [41], to mention a few. Such noise measurements are also becoming useful as a pretty innocuous method for the determination of structural disorders entered during production or operation of the devices [42,43]. The extent of stress suffered by QD during its growth produces lattice defects which diffuse through the QD structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of noise shape on excitation kinetics of impurity doped quantum dots

Pal¹,

Sinha

Ganguly³

et al. 2014

Manufacturing Review

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-Noise influences the functioning of nanomaterials and optoelectronic materials to a significant extent. We investigate the excitation kinetics of a repulsive impurity doped quantum dot initiated by the application of external white noise with special reference to noise shape. We have exploited white noise of Gaussian and Lorentzian shapes. The said shapes in effect alter the range of spatial correlation of the white noise. We have considered both additive and multiplicative noise (in Stratonovich sense). In conjunction with the shape, the noise strength and the dopant location also fabricate the kinetics in a delicate way. Moreover, the influences of additive and multiplicative nature of the noise on the excitation kinetics have been observed to be prominently different. Interestingly as well as surprisingly enough, in case of additive noise, the noise strength does not affect the kinetics. The investigation reveals that the Lorentzian shape invites more diversities in the excitation kinetics when noise strength and dopant location are varied over a range than the Gaussian one. The Lorentzian shape causes a surge in the excitation rate over the other shape. The present investigation provides some useful perceptions of the functioning of mesoscopic devices where noise plays some profound role. Implications and influences: The present work assumes to have significance in engineering and technological applications of quantum dot nanodevices. Since in most of the devices noise plays some important role, the present study could also sincerely motivate further research on optical properties of those devices in presence of noise.

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Low frequency noise in GaAs structures with embedded In(Ga)As quantum dots

Cited by 11 publications

References 22 publications

Influence of Gaussian white noise on the frequency-dependent first nonlinear polarizability of doped quantum dot

Influence of Gaussian white noise on the frequency-dependent first nonlinear polarizability of doped quantum dot

Excitation Kinetics of Impurity Doped Quantum Dot Triggered by Gaussian White Noise

Influence of noise shape on excitation kinetics of impurity doped quantum dots

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